Stop in for a cup of coffee

I Thought you had the MDS turned off?
I did, just about 6 months ago. Had the Durango almost 3 years now.

And that makes no sense since I get 17 mpg on the highway in my ‘06 SRT with no MDS, 3.92 rear, and a custom tune adding 20% extra fuel.

It's true. If I stretch it till the light comes on, I can maybe, maybe get 300-310 mile range. On a 34 gallon tank. If I hit the gas station right as the Light comes on, max fill up is a tad over 29 gallons. I usually try filling up at 1/4 tank, usually around 250 miles. That's usually around 23-25 gallons.